are there any simple tools/methods to make a browser extension available in all major browsers without bothering with each too much?
Else, will the code tend to be be easier/completely portable using a mighty language like java instead of javascript and therefore less browser sepecific code?
Yet for all browsers (Chrome, Firefox, [ie, Opera, Safari or more]) i saw http://www.besttoolbars.net/products/addon_framework/download/, http://en.wikipedia.org/wiki/Browser_toolbar#Cross-Browser_Toolbar_Development , etc.
but dont know if any of these are completely free?
and if they allow something for http head/status code request to external domains? (like wiki.greasespot.net/GM_xmlhttpRequest does, which won't workout with an injected javascript alone as of cross-site-scriting.)